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我在客户支持部门工作,我正在使用 scikit-learn 来预测我们的票的标签,给定一组训练票(训练集中大约 40,000 张票)。

我正在使用基于这个的分类模型。它只是预测“()”作为我的许多测试票证的标签,即使训练集中的票证都没有标签。

我的标签训练数据是一个列表列表,例如:

tags_train = [['international_solved'], ['from_build_guidelines my_new_idea eligibility'], ['dropbox other submitted_faq submitted_help'], ['my_new_idea_solved'], ['decline macro_backer_paypal macro_prob_errored_pledge_check_credit_card_us loading_problems'], ['dropbox macro__turnaround_time other plq__turnaround_time submitted_help'], ['dropbox macro_creator__logo_style_guide outreach press submitted_help']]

虽然我的工单描述训练数据只是一个字符串列表,例如:

descs_train = ['description of ticket one', 'description of ticket two', etc]

这是我构建模型的代码的相关部分:

import numpy as np
import scipy
from sklearn.pipeline import Pipeline
from sklearn.feature_extraction.text import CountVectorizer
from sklearn.feature_extraction.text import TfidfTransformer
from sklearn.multiclass import OneVsRestClassifier
from sklearn.svm import LinearSVC

# We have lists called tags_train, descs_train, tags_test, descs_test with the test and train data

X_train = np.array(descs_train)
y_train = tags_train
X_test = np.array(descs_test)  

classifier = Pipeline([
    ('vectorizer', CountVectorizer()),
    ('tfidf', TfidfTransformer()),
    ('clf', OneVsRestClassifier(LinearSVC(class_weight='auto')))])

classifier.fit(X_train, y_train)
predicted = classifier.predict(X_test)

但是,“predicted”给出的列表如下所示:

predicted = [(), ('account_solved',), (), ('images_videos_solved',), ('my_new_idea_solved',), (), (), (), (), (), ('images_videos_solved', 'account_solved', 'macro_launched__edit_update other tips'), ('from_guidelines my_new_idea', 'from_guidelines my_new_idea macro__eligibility'), ()]

我不明白为什么当训练集中没有空()时它会预测空白()。它不应该预测最近的标签吗?谁能推荐我正在使用的模型的任何改进?

非常感谢您提前提供的帮助!

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2 回答 2

5

问题出在你的tags_train变量上。根据OneVsRestClassifier文档,目标需要是“一系列标签序列”,并且您的目标是一个元素的列表。

以下是您的代码的经过编辑的、独立的和工作的版本。请注意 中的变化tags_train,特别是 thetags_train是一个单元素元组这一事实。

import numpy as np
import scipy
from sklearn.pipeline import Pipeline
from sklearn.feature_extraction.text import CountVectorizer
from sklearn.feature_extraction.text import TfidfTransformer
from sklearn.multiclass import OneVsRestClassifier
from sklearn.svm import LinearSVC


# We have lists called tags_train, descs_train, tags_test, descs_test with the test and train data
tags_train = [('label', ), ('international' ,'solved'), ('international','open')]
descs_train = ['description of ticket one', 'some other ticket two', 'label']

X_train = np.array(descs_train)
y_train = tags_train
X_test = np.array(descs_train)  

classifier = Pipeline([
    ('vectorizer', CountVectorizer()),
    ('tfidf', TfidfTransformer()),
    ('clf', OneVsRestClassifier(LinearSVC(class_weight='auto')))])

classifier = classifier.fit(X_train, y_train)
predicted = classifier.predict(X_test)

print predicted

输出是

[('international',), ('international',), ('international', 'open')]
于 2013-06-11T20:23:57.017 回答
0

即使在将目标从一个元素列表转换为序列之后,仍然面临 () 预测

在此处输入图像描述

于 2019-08-30T12:45:33.630 回答